Update changelogs for 0.5.3.
0.5.3
Less verbose init logging.

Statement detailing controller joint count, as well as segment and hardware
interface types moved from INFO to DEBUG severity.
Fix license header string for some files.
Create README.md
Update README.md
Silence cppcheck warning on unit'ed variables.
Merge branch 'hydro-devel' of https://github.com/willowgarage/ros_controllers into hydro-devel
Flip state error sign.